JP3642722B2 - Paint drying equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is for drying a coated material coated with a paint on the surface thereof, such as a film intended to shield ultraviolet rays of sunlight on a window glass of a building or an automobile, or an original fabric of a magnetic recording medium, etc. The present invention relates to an apparatus for drying painted materials .
[0002]
[Prior art]
For example, a technique disclosed in Japanese Utility Model Publication No. 3-1089 is known as a conventional drying method and drying apparatus for a coated product.
In the technique disclosed in this publication, a coated object that is an object to be dried is continuously fed into a drying chamber, and the interior of the drying chamber is partitioned in advance into a plurality of regions along the transfer direction of the coated material. A temperature sensor is installed in each of the areas, and the temperature control of each area is performed by controlling the amount of hot air supplied to each area based on the detection signal emitted from the temperature sensor, and thus the coated object Is to be dried.
[0003]
[Problems to be solved by the invention]
However, in the drying method and the drying apparatus for drying the coated product while controlling the temperature of each divided area of the drying chamber with the temperature sensor as described above, the uneven drying on the thin film made of the paint applied on the surface of the coated product is performed. There was a problem that occurred.
The present inventors have examined various causes of the occurrence of drying unevenness. As a result, the flow of hot air generated between the partitioned areas of the drying chamber, particularly the direction in which the hot air flows, is one of the major factors that cause drying unevenness. I found out.
[0004]
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a drying apparatus for a coated product that can be ideally dried without causing uneven drying on a thin film formed on the surface of the coated product. It is in.
[0005]
[Means for Solving the Problems]
In order to solve such a problem, in the invention according to claim 1, drying of the coated material is performed by continuously feeding the coated material with the coating material applied to the surface to the drying chamber and drying the coated material with hot air supplied to the drying chamber. In the apparatus, the interior of the drying chamber is partitioned into a plurality of regions along the direction of transfer of the paint, hot air supply means provided in each of the partitioned regions for supplying hot air, and exhausting the air in the regions. Each region inside the drying chamber is balanced by a discharge means, a pressure sensor provided in each region, and a balance between the amount of hot air supplied in each region and the amount of exhaust discharged based on the detection value of the pressure sensor. The pressure control means for controlling the pressure in each area and the hot air supply means in each area so that the pressure is highest in the area on the outlet side of the paint, and then the pressure gradually decreases toward the inlet side of the paint. Preparation Temperature control for controlling the temperature of each area so that the temperature at the outlet side of the paint product is highest among the areas inside the drying chamber and then gradually decreases toward the entrance side of the paint product. Each area inside the drying chamber is supplied with hot air by the hot air supply means on one side where the paint of the paint to be transferred is applied, and each area is inserted through the paint. The communicating opening portion is characterized in that the surface side on which the coating material is not applied is opened larger than the surface side on which the coating material is applied.
[0010]
According to the present invention, a pressure sensor is provided in each partitioned region of the drying chamber, and the pressure in each region is controlled based on the detected value of the pressure sensor, so that the pressure in each region can be set to a predetermined value. . For this reason, it is possible to arbitrarily control the flow of hot air between the areas based on the pressure difference between the areas. Therefore, the optimum temperature and humidity for the paint body such as a film and the paint applied thereon As a result, an ideal drying without unevenness in drying can be performed.
[0011]
That is, for example, there are three partitioned areas of the drying chamber, and among these areas, the area on the exit side of the paint is Z11c, the center area is Z11b, and the area on the entrance side of the paint is Z11a. By setting the pressure in the region to Z11c>Z11b> Z11a, conversely, setting to Z11c <Z11b <Z11a, or setting Z11b> Z11a = Z11c, etc. It became possible to provide the optimum temperature and humidity environment according to the paint body and paint, and as a result, it became possible to eliminate uneven drying.
[0012]
Further, by providing a pressure sensor in each partitioned area and controlling the pressure in these areas, for example, the pressure in each area can be made higher than the pressure outside the drying chamber, and thus the outside of the drying chamber. It is possible to prevent the minute trash from entering the drying chamber and to obtain a high-quality dried paint surface on the surface of the coated object.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 is a side view showing an apparatus for drying a coated product according to the present invention, FIG. 2 is a plan view of a drying chamber, and FIG. 3 is an enlarged view of a iii circle portion of FIG.
[0014]
In FIG. 1, reference numeral 1 denotes a coater chamber, and here a coated body 2a such as a film is supplied from a film supply means (not shown). When the supplied coated body 2a passes through the coating head 3, the coating 2b is applied to one surface of the coated body 2a with a predetermined thickness to become a coated object 2 which is a dry object. Thereafter, the coated product 2 passes through several rollers 5, reaches the drying chamber 10, and is dried until the liquid content becomes appropriate. Thereafter, the dried coated product 2 is discharged from the drying chamber 10 to the outside and wound by a winder.
Here, the shape of the coated body 2a is not particularly limited, but a strip-like material such as coated paper or a coated film, a sheet-like material or web continuously conveyed, or the like is preferable.
[0015]
The inside of the drying chamber 10 is divided into a plurality of, for example, three regions Z11a, Z11b, and Z11c along the transfer direction of the coating 2 as shown in the figure. Each of the regions Z11a, Z11b, Z11c and the devices associated therewith in the drying chamber has the same configuration.
[0016]
That is, in each area | region Z11a, Z11b, Z11c in the drying chamber 10, the hot air supply means 12 which supplies hot air, and the discharge means 13 which exhausts the air in an area | region are provided, respectively. The hot air supply means 12 is attached to the tip of the duct 16 and is tapered, with a fan 15 for supplying air, a duct 16 extending from the outlet of the fan 15, a heater 17 interposed in an intermediate portion of the duct 16. It consists of a hot air outlet 18 that spreads in a shape. The fan 15, the main part of the duct 16, and the heater 17 are disposed outside the drying chamber 10, and only a part of the duct 16 and the hot air outlet 18 are disposed in the respective regions Z11a, Z11b, Z11c in the drying chamber 10, The hot air outlet 18 is arranged so as to face one side (the upper surface side in FIG. 1) on which the paint 2b of the coated object 2 to be transferred is applied. As shown in FIG. 2, the hot air outlet 18 has a width dimension m (of the coating object 2 so as to cover the entire width of the coating object 2 to be transferred in each region Z11a, Z11b, Z11c of the drying chamber 10. The dimension in the direction perpendicular to the transfer direction) is set, and the length dimension n is set in the state of being close to the inner wall of each region so that as much hot air as possible can be supplied to the transferred object 2 to be transferred. Yes.
[0017]
Further, the discharge means 13 is provided on the ceiling portion of Z11a, Z11b, Z11c in each region of the drying chamber 10 at the leading end of the duct 20 and the duct 20 extending from the suction port of the fan 19 and the suction port of the fan 19. It consists of the suction inlet 21 made. A damper 22 is interposed in the middle part of the duct 20.
[0018]
The duct 20 constituting the discharge means 13 is branched separately from the path connected to the exhaust fan 19, and the branch duct 20 a is connected to the suction side of the air supply fan 15 constituting the hot air supply means 12. Has been. That is, not all the air sucked from the suction port 21 is discharged to the outside, but a part of the air is connected to the hot air supply means 12 via the ducts 20 and 20a, and the regions Z11a, Z11b, An air circulation system for each Z11c is configured.
Further, a new air introduction duct 20b is connected to the branch duct 20a, from which new air is introduced into the hot air supply means 12.
Further, the exhaust air for each of the regions Z11a, Z11b, and Z11c discharged by the exhaust fan 19 is collected in an air discharge duct, and is led from there to an exhaust gas combustion furnace (not shown).
[0019]
Each region Z11a, Z11b, Z11c is provided with a pressure sensor 23, and the pressure sensor 23 is electrically connected to the pressure control means 24a, 24b, 24c, respectively.
The pressure control means 24a, 24b, 24c controls the pressure in each of the regions Z11a, Z11b, Z11c by balancing the amount of hot air supplied in each region and the amount of exhaust discharged.
[0020]
Specifically, the pressure control means 24a, 24b, 24c is configured so that the pressure values of the respective regions Z11a, Z11b, Z11c detected by the pressure sensor 23 are stored in the pressure setting unit built in the pressure control means 24a, 24b, 24c. It is determined whether the pressure value is within an allowable range with respect to a preset pressure value. If the pressure value is not within the allowable range, the frequency of the current supplied to the exhaust fan 19 is changed to change the rotational speed of the fan 19. Thus, control is performed so that the pressure values of the respective regions Z11a, Z11b, and Z11c fall within an allowable range with respect to the pressure values set in advance in the pressure setting unit.
[0021]
Here, it is preferable to change the frequency of the current supplied to the exhaust fan 19, and the rotation speed of the fan 19 is changed, but each region can be changed by changing the voltage value supplied to the exhaust fan 19. The pressure values of Z11a, Z11b, and Z11c may be changed, and further, the pressure values of the regions Z11a, Z11b, and Z11c may be changed by adjusting the opening degree of the damper 22.
[0022]
A temperature control means 25 is provided in the hot air supply means 12 provided in each of the regions Z11a, Z11b, and Z11. The temperature control means 25 is provided with a temperature sensor in the air supply duct 16 so that the temperature of the hot air supplied to each of the regions Z11a, Z11b, and Z11 falls within a preset temperature range. The heater 17 is on / off controlled or proportionally controlled.
[0023]
In addition, an opening 26 is provided between the regions Z11a, Z11b, and Z11c in the drying chamber 10 so that the coated object 2 can be transferred. The surface side (the lower surface side in FIG. 1) on which the coating material is not applied is opened larger than the surface side (the upper surface side in FIG. 1) on which the coating is applied.
[0024]
Next, the drying method using the coating-material drying apparatus of the said structure is demonstrated.
In the coater chamber 1, a coated body 2a such as a film is supplied from a film supply means (not shown). When the supplied coated body 2a passes through the coating head 3, as shown in FIG. 3, the coating 2b is coated with a predetermined thickness on one side to become a coated object 2 that is a drying object.
[0025]
The coating 2 enters the drying chamber 10 after passing through several rollers 5.
In the drying chamber 10, the temperature of the hot air supplied to each zone Z11a, Z11b, Z11c and the pressure in each zone are controlled by the temperature control means 25 and the pressure control means 24a, 24b, 24c.
For example, the blowout temperature of the hot air to the regions Z11a, Z11b, and Z11c is the highest in the region Z11c on the exit side of the painted object 2 among these regions Z11a, Z11b, and Z11c, and then toward the inlet side of the painted object 2 The temperature is controlled so that the temperature decreases sequentially. If a specific example is given, the blowing temperature of the hot air to the area Z11c on the outlet side of the coated object 2 is 200 ° C., the blowing temperature of the hot air to the central area Z11b is 140 ° C., and the area Z11a on the inlet side of the coated object The hot air blowing temperature is 90 ° C.
[0026]
Further, for example, the pressures in the regions Z11a, Z11b, and Z11c are the pressures in the regions Z11a, Z11b, and Z11c, where the pressure in the region Z11c on the outlet side of the painted object 2 is the highest and then gradually increases toward the inlet side of the painted object 2 The pressure is controlled so as to decrease. As a specific example, the pressure in the region Z11c on the outlet side of the coated object 2 is +0.4 mmAq, the pressure in the central region Z11b is +0.2 mmAq, and the pressure in the region Z11a on the inlet side of the coated object 2 is 0.0 mmAq. It is.
[0027]
If the hot air blowing temperature and pressure to each region are set as described above, a part of the air in the region Z11c on the outlet side of the coating 2 flows into the central region Z11b, and one part of the air in the central region Z11b The part flows into the area Z11a on the entrance side of the coated object 2. In addition, the openings 26 between the regions Z11a, Z11b, and Z11c in the drying chamber 10 are not coated with paint more than the surface side (the upper surface side in FIG. 1) to which the paint of the coated object 2 is applied. The surface side (the lower surface side in FIG. 1) has a larger opening, and the flow of hot air between the regions Z11a, Z11b, and Z11c is mainly the side on which the paint 2b of the coated object 2 is not applied (FIG. 1). In the lower space).
[0028]
Therefore, as shown in FIG. 1, the temperature distribution in the space below the coated object 2 in each region Z11a, Z11b, Z11c is 180 ° C. in the space below the region Z11c on the outlet side of the coated object 2, and the region Z11c The lower part of the opening 26 connecting the central region Z11b adjacent thereto is 175 ° C., the space below the coating object 2 in the central region Z11b is 150 ° C., and the region Z11b and the region Z11c on the inlet side of the coating object 2 are The lower part of the opening 26 to be connected is 130 ° C., and the space below the area on the entrance side of the coating 2 is 100 ° C.
[0029]
That is, in the drying chamber 10, in the initial stage of drying, the temperature in the vicinity of the coated object 2 is higher on the surface side where the paint 2 b is not applied than on the surface side where the paint 2 b is applied. In other words, in the initial stage of drying, the coating material 2 is dried not from the exposed coating material side but from the coating material body 2a side, so that the type of the coating material body 2a, the type of coating material to be applied, etc. Depending on the type of paint body 2a and a combination of paints, it is possible to provide an ideal dry environment for the combination of heating from the paint body 2a side.
[0030]
And the coating material 2 is dried until it becomes a liquid content suitably, when passing each area | region Z11a, Z11b, Z11c of the drying chamber 10 set to the above temperature conditions.
Thereafter, the dried coated product 2 is discharged from the drying chamber 10 to the outside and wound up by a winder.
[0031]
Further, as described above, the pressure in each of the regions Z11a, Z11b, and Z11c is set to a pressure equal to or higher than the atmospheric pressure, so that minute dust on the outside of the drying chamber 10 enters the drying chamber 10. Therefore, a high-quality dried paint surface can be obtained on the surface of the coated object 2.
[0032]
The embodiment described above is merely an example for explaining the present invention, and the design can be changed as appropriate without departing from the gist of the invention.
[0033]
【The invention's effect】
As described above, according to the present invention, a pressure sensor is provided in each partitioned region of the drying chamber, and the pressure in each region is controlled based on the detection value of the pressure sensor. It can be set to a predetermined value. For this reason, it is possible to arbitrarily control the flow of hot air between the areas based on the pressure difference between the areas. Therefore, the optimum temperature and humidity for the paint body such as a film and the paint applied thereon As a result, an ideal drying without unevenness of drying can be performed.
[0034]
Further, by providing a pressure sensor in each partitioned area and controlling the pressure in these areas, for example, the pressure in each area can be made higher than the pressure outside the drying chamber, and thus the outside of the drying chamber. Therefore, it is possible to obtain a high-quality dried paint surface on the surface of the coated object.
[0035]
In addition, the pressure control means controls the pressure in each area so that the pressure on the outlet side of the paint is the highest among the areas inside the drying chamber, and then the pressure gradually decreases toward the inlet of the paint. Then, the flow of the hot air from the area | region of the exit side of a coating material to the area | region of the inlet side of a coating material can be ensured. That is, it is possible to form a hot air flow from a region having a low liquid content to a region having a high liquid content, and efficient drying can be performed.
Also, the temperature control means controls the temperature of each area so that the temperature on the outlet side of the painted product is highest among the regions inside the drying chamber, and then gradually decreases toward the inlet side of the coated material. Then, in combination with the above pressure control, a hot air flow from a high temperature region to a low temperature region can be formed, and in this respect also, efficient drying can be performed.
Furthermore, in each area inside the drying chamber, hot air is supplied by hot air supply means to one side on which the paint of the transferred paint to be applied is applied, and an opening that communicates each area to allow the paint to pass through, If the surface side where the paint is not applied is opened larger than the surface side where the paint of the paint is applied, it is not directly heated from the surface side where the paint is applied in the initial stage of drying. Heating can be performed from the coated body side, and an ideal drying environment can be provided depending on the combination of a certain coated body and paint.
[Brief description of the drawings]
FIG. 1 is a side view showing an apparatus for drying a coated article according to the present invention.
FIG. 2 is a plan view of a drying chamber.
FIG. 3 is an enlarged view of a iii circle portion in FIG. 1;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Drying chamber Z11a, Z11b, Z11c ... Area | region 12 ... Hot-air supply means 13 ... Exhaust means 15 ... Air supply fan 17 ... Heater 19 ... Exhaust fan 23 ... Pressure sensor 24a, 24b, 24c ... Pressure control means 25 ... Temperature control means 26 ... Opening

Claims (1)

In an apparatus for drying a coated material, the coated material having a surface coated with a paint is continuously sent to a drying chamber, and the coated material is dried by hot air supplied to the drying chamber.
  The interior of the drying chamber is partitioned into a plurality of regions along the direction of transfer of the paint,
  A hot air supply means that is provided in each of the partitioned areas and supplies hot air respectively;
  A discharge means for discharging air in the area;
  A pressure sensor provided in each region;
  Based on the detected value of the pressure sensor, the amount of hot air supplied in each region and the amount of exhaust air discharged are balanced, and among the regions inside the drying chamber, the region on the outlet side of the paint product has the highest pressure. Then, pressure control means for controlling the pressure in each region so that the pressure gradually decreases toward the inlet side of the paint,
  Provided in the hot air supply means in each region, among the regions inside the drying chamber, the region on the outlet side of the coated product is the highest temperature, and then the temperature decreases sequentially toward the inlet side of the coated material, Temperature control means for controlling the temperature of each region,
  In each region inside the drying chamber, hot air is supplied by the hot air supply means to one side of the coating material to be transferred, and an opening that communicates each region to allow the coating material to pass through is provided. An apparatus for drying a coated object, wherein the surface side to which the paint is not applied is opened larger than the surface side to which the paint is applied.

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